500 KVA Core Testing Overview
When rewinding motors, testing is a vital step for corrective maintenance. This test should be performed prior to removing the windings to see if there is a damaged core iron. After the windings are removed, the core is retested again to be sure there was no damage done while removing the old winding. If damaged, the motor can still run, but motor efficiency and lifespan will be greatly reduced. The motor will generate more heat since it will consume more power to operate normally. The heat will reduce its lifespan and increase the costs of the performance and maintenance.
Benefits
This testing is designed to predict reliability and operating cost of a motor after repair. The reason for a core loss test to be performed is to determine if the core iron of a motor has been damaged. These damages could include:
- Rotor
- Armature
- Field Coils
- Electrical Arcing
- Short in the Stator
Process
Core testing large motors has become state of the art. With this fully automated Phenix core tester, motors up to approximately 25,000 hp can be tested. Computerized operations record all data permanently and printouts are generated for each test. Core testing is performed efficiently and accurately with calibration performed by the manufacturer.
Media and Links
Bradleys' 500KVA Core Testing Information
Core Testing PowerPoint PresentationDetails: The Heart of Quality and Successful Repair of Induction Motors and Armatures presentation is made available by The Rotating Machines Working Group, which is a body of engineering decision makers, that gather every 3 years to discuss relevant issues affecting the electrical rotating machines industry.
http://www.phenixtech.com/3-Core_Loss.aspDetails: Learn information directly from the manufacturer concerning core loss testing and the machinery used to do so.